An equilateral triangle inscribed in a circle is divided by a diameter parallel to one of it’s sides. What is the proportion light : dark blue?

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## Solution

The proportion light to dark blue is 4 : 5.

This solution uses the fact that the diameter passes through the incenter of the triangle, at two-third height from the triangle base.

## Poem

Mount Fuji

Covered with snow

A sacred place to go

One can climb on Mount Fuji

Not in a hurry but slowly

He is so well known

With it’s white and beautiful cone

Sightseers and climbers

All together

Love you better and better

They have a lot of fun

In the land of the rising sun